EP2205840A1 - Prechamber arrangement of a combustion engine - Google Patents

Prechamber arrangement of a combustion engine

Info

Publication number
EP2205840A1
EP2205840A1 EP08847324A EP08847324A EP2205840A1 EP 2205840 A1 EP2205840 A1 EP 2205840A1 EP 08847324 A EP08847324 A EP 08847324A EP 08847324 A EP08847324 A EP 08847324A EP 2205840 A1 EP2205840 A1 EP 2205840A1
Authority
EP
European Patent Office
Prior art keywords
prechamber
body part
arrangement according
nozzle
prechamber arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08847324A
Other languages
German (de)
French (fr)
Other versions
EP2205840B1 (en
Inventor
Ulf Granlund
Aulis Silvonen
Lars Ola LIAVÅG
Petri Saari
Hannu SILLANPÄÄ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wartsila Finland Oy
Original Assignee
Wartsila Finland Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wartsila Finland Oy filed Critical Wartsila Finland Oy
Publication of EP2205840A1 publication Critical patent/EP2205840A1/en
Application granted granted Critical
Publication of EP2205840B1 publication Critical patent/EP2205840B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
    • F02B19/1004—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder details of combustion chamber, e.g. mounting arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/12—Engines characterised by precombustion chambers with positive ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
    • F02B19/165—The shape or construction of the pre-combustion chambers is specially adapted to be formed, at least in part, of ceramic material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a prechamber arrangement of a combustion engine according to the preamble of Claim 1.
  • nitrogen oxides are produced when a mixture of fuel and air is burnt.
  • the amount of nitrogen oxides increases when the combustion temperature rises.
  • High peak combustion temperatures increase the formation of nitrogen oxides, in particular.
  • the peak combustion temperatures and, thus, the amount of nitrogen oxides formed in the combustion can be decreased by increasing the air/fuel ratio of the fuel mixture, i.e., using a leaner fuel mixture.
  • diesel engines which are based on compression ignition, large amounts of nitrogen oxides are produced. Consequently, gas engines are often preferably used because lesser amounts of ni- trogen oxides are produced therein.
  • the combustion may be incomplete especially in piston engines, where the cylinder diameter is large.
  • auxiliary devices such as spark plugs are needed to cause ignition.
  • some lean mixture engines use a prechamber that is connected to the combustion space of the cylinder. A richer fuel mixture is fed into the prechamber to be ignited and conveyed to the combustion space, whereby the leaner fuel mixture in the com- bustion space ignites.
  • the prechamber is employed especially in lean mixture engines that use gas as fuel. In that case, the prechamber is provided with a spark plug, which is used to ignite the richer fuel mixture.
  • the prechambers are rotationally symmetrical.
  • the actual chamber, where the fuel is ignited may vary as to its shape, being spherical or elliptical, for example.
  • the prechamber is connected to the main combustion space by a channel, which ends in several nozzle openings.
  • the number, the direction and the diameter of the openings are optimized according to the respective situation, taking into account piston reliefs, for example.
  • a glow element or a spark plug is used as an ignition aid.
  • a disadvantage of the arrangement is the high temperature in the prechamber, whereby traditional materials do not endure; hot corrosion may occur, for example.
  • the nozzle openings are subjected to stress, when the combustion reaction advances from the prechamber to the combustion space through the nozzle openings. In that case, the parts must be replaced or new usable materials must be found.
  • the prechamber is subjected to great high-pressure gradients and maximum pressures.
  • the purpose of the invention is to provide an arrangement that minimizes the problems of known technology.
  • the purpose of the invention is to provide an arrangement, which can be used to improve the structure and the operation of the prechamber, enabling a simple installation and facilitating the maintenance and repair operations.
  • the body part is supported on a cylinder head and provided with joint surfaces to support the nozzle part on the body part.
  • the solution is simple and easy to install and detach for maintenance and repair.
  • the said joint surfaces of the body part are preferably conical.
  • the nozzle part can preferably be attached to the body part by means of a shrink fit, whereby these parts are made to compress against each other so that the arrangement stays together without extra components and other fastening means.
  • the prechamber arrangement comprises a locking part arranged inside the prechamber, by which the nozzle part is attached to the body part.
  • the separate locking part can be used to ensure that the body part and the nozzle part stay in place attached to each other under all conditions, but that they can still be detached from each other, as desired, depending on the attachment solution used.
  • the locking part can with advantage be attached to the body part by a shrink fit, welding, soldering, a friction joint or a threaded joint or the like.
  • the locking part includes a wedge-shaped element, which is arranged between the actual locking part and the body part.
  • the locking part itself is a wedge-shaped component or a number of components that are arranged between the shaped head of the nozzle part, which is on the side of the prechamber, and the body part. The wedge effect can be used to further secure the stability of the attachment.
  • the locking part is shaped into a uniform structure so that no interferences are caused to the flows in the prechamber. When needed, the locking part can also be cooled.
  • the body part can with advantage be provided with a separate cover part, which is attached thereto and by means of which the prechamber arrangement is attached to the cylinder head. In this way, more freedom is allowed for the manufacture and the selection of materials. With respect to the manufacture, the body part can have stricter tolerance requirements because of the parts that are attached to the body part or parts that surround the same.
  • the body part can preferably be manufactured of a heat-resistant material, such as steel or another metal alloy.
  • the cover part is provided with an ignition means, such a feeding means of the pilot fuel and/or a spark plug, whereby its machineability is significant for the selection of material.
  • an ignition means such a feeding means of the pilot fuel and/or a spark plug
  • Both the nozzle part and the locking part can with advantage be manufactured of a heat-resistant, oxidation-resistant and/or corrosion-resistant material, such as ceramics.
  • a heat-resistant, oxidation-resistant and/or corrosion-resistant material such as ceramics.
  • the best properties of the ceramics can be utilized in the most advantageous manner.
  • the body part and the locking part are rotationally symmetrical components. That way, also the behaviour of the components in varying heat and corrosion conditions is consistent, which is suited to prevent the parts from breaking.
  • the invention also enables the body part, the nozzle part and the locking part to be replaceable. In that case, when a part breaks, the remaining parts can be utilized, which is advantageous for the maintenance and the costs.
  • Fig. 1 shows a basic cross section of the upper part of a cylinder of an engine and its cylinder head, and a cutaway drawing of a prechamber arrangement according to the invention installed in connection therewith;
  • Fig. 2 shows an enlargement of the arrangement of the locking part and the nozzle part based on the prechamber arrangement of Fig. 1 ,
  • FIGs. 3 and 4 show enlargements of alternative embodiments of the locking part related to the prechamber arrangement according to the invention.
  • Reference number 1 in the drawings refers to a combustion engine comprising a cylinder head 2 and at least one cylinder including a cylinder sleeve 6 and a main combustion space 7.
  • the gas exchange of the cylinder is arranged, in a manner known per se, through the channels of the cylinder head 2 and the valves that are provided in connection with the same.
  • a separate prechamber arrangement connected to the cylinder, including a body part 4 and a cover part 9 that is supported on the body part, which together essentially define a prechamber 3, which through a nozzle part 5 provided with nozzle openings 5a communicates with the main combustion space 7 of the cylinder.
  • the cylinder head 2 comprises a recess or a similar space for the prechamber arrangement, whereby the body part 4 is supported on the cylinder head 2 by means of its joint surface 4a.
  • the attachment of the body part 4 to the cylinder head 2 is arranged by means of the cover part 9 by bolts 10.
  • the cover part 9 does not need to be separately attached to the body part 4, but these parts are arranged against each other by means of suitably shaped corresponding sur- faces, as shown in Fig. 1.
  • the cover part 9 comprises, in a manner known per se, what are called feeding means 11 for the pilot fuel and a spark plug 12.
  • the ignition and combustion process itself is carried out in a manner known as such; therefore, it is not described here in detail.
  • the lower part of the body part 4 is shaped so that the nozzle part 5 of the prechamber arrangement is directly supported on the body part 4.
  • the body part 4 can be manufactured of steel or another metal alloy that is good in enduring heat, and the nozzle part 5 preferably comprises ceramic or other corresponding material, which also endures intense heat and cor- rosion. Consequently, the body part 4 and the nozzle part 5 can preferably be attached to each other, for example, utilizing the shrink fit and without any other fastenings. Consequently, they can also be detached from each other, as needed, and thus also separately replaced.
  • the prechamber in practice is shaped in a manner required by the desired flow conditions, generally, on the inside by using rounded surfaces.
  • the number, the size and the orientation of the nozzle openings 5a of the nozzle part 5 are selected as needed.
  • the joint surface 4a of the body part 4 can preferably be conical.
  • the joint surface 4b between the body part 4 and the nozzle part 5 is preferably conical in the manner shown in the figure.
  • the body part 4 and the nozzle part 5 can also be attached to each other by means of a separate locking part 8, which can be attached to the body part 4, for example, by a shrink fit, welding, soldering, a threaded joint, or in some other similar manner.
  • a separate locking part 8 can be used to secure the attachment of the nozzle part 5, as needed, and its staying in place under the operating conditions of the engine.
  • the locking part 8 is preferably a uniform, annular component. This is best seen in Fig. 2, which shows an enlargement of the arrangement of the locking part and the nozzle part based on the prechamber arrangement of Fig. 1.
  • Figs. 3 and 4 show alternative embodiments of the locking part, comprising a wedge shape and, as a consequence, a wedge effect, pro- viding additional possibilities for the selection of the way of attachment.
  • the locking part comprises two components 8a and 8b, the latter providing the wedge effect.
  • Component 8a in turn, can preferably be attached by the shrink fit to the rest of the structure, whereby it can also be detached and replaced but, as needed, the attachment can also be carried out by welding, for example.
  • the upper end 5b of the nozzle part 5 is shaped to be upwards convergent in the figure so that the actual locking part 8' herein is a wedge-shaped component that is installed between the said upper end of the nozzle part 5 and the body part 4.
  • the nozzle part 5 can also be constructed of various components, such as sectors, and they can be attached to the body part 4 by means of the locking part 8 or 8'.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The invention relates to a prechamber arrangement to be fitted into the cylinder head (2) of a combustion engine (1), comprising a separate body part(4) and a nozzle part (5), which together mainly define a prechamber (3), which is connected to a main combustion space (7) of a cylinder (6) through nozzle openings (5a) of the nozzle part (5). According to the invention, the body part(4) is supported on the cylinder head (2) and provided with joint surfaces (4b) for supporting the nozzle part (5) on the body part(4).

Description

PRECHAMBER ARRANGEMENT OF A COMBUSTION ENGINE
The invention relates to a prechamber arrangement of a combustion engine according to the preamble of Claim 1.
In combustion engines, nitrogen oxides (NOx) are produced when a mixture of fuel and air is burnt. Typically, the amount of nitrogen oxides increases when the combustion temperature rises. High peak combustion temperatures increase the formation of nitrogen oxides, in particular. The peak combustion temperatures and, thus, the amount of nitrogen oxides formed in the combustion can be decreased by increasing the air/fuel ratio of the fuel mixture, i.e., using a leaner fuel mixture. Particularly in diesel engines, which are based on compression ignition, large amounts of nitrogen oxides are produced. Consequently, gas engines are often preferably used because lesser amounts of ni- trogen oxides are produced therein. However, due to the lean fuel mixture, the combustion may be incomplete especially in piston engines, where the cylinder diameter is large.
In lean mixture engines or Otto-cycle engines, the ignition does not take place automatically but auxiliary devices, such as spark plugs are needed to cause ignition. To enhance combustion and to protect the ignition means, some lean mixture engines use a prechamber that is connected to the combustion space of the cylinder. A richer fuel mixture is fed into the prechamber to be ignited and conveyed to the combustion space, whereby the leaner fuel mixture in the com- bustion space ignites. The prechamber is employed especially in lean mixture engines that use gas as fuel. In that case, the prechamber is provided with a spark plug, which is used to ignite the richer fuel mixture.
Generally, the prechambers are rotationally symmetrical. The actual chamber, where the fuel is ignited, may vary as to its shape, being spherical or elliptical, for example. The prechamber is connected to the main combustion space by a channel, which ends in several nozzle openings. The number, the direction and the diameter of the openings are optimized according to the respective situation, taking into account piston reliefs, for example. In spite of a relatively high compression ratio, a glow element or a spark plug is used as an ignition aid.
A disadvantage of the arrangement is the high temperature in the prechamber, whereby traditional materials do not endure; hot corrosion may occur, for example. In particular, the nozzle openings are subjected to stress, when the combustion reaction advances from the prechamber to the combustion space through the nozzle openings. In that case, the parts must be replaced or new usable materials must be found. Particularly in gas engines, the prechamber is subjected to great high-pressure gradients and maximum pressures.
Specification US 4426966 discloses prechamber arrangements, which have complex structures and supports and, consequently, high manufacturing costs. These known solutions employ ceramic material in some parts of the prechamber. The ceramic materials endure heat and corrosion well but, on the other hand, are fragile, expensive and difficult to machine. Furthermore, the different coefficients of heat expansion of the ceramic materials can cause problems in the joints, as the lower part of the prechamber with its nozzle openings, in par- ticular, is subjected to stress.
The purpose of the invention is to provide an arrangement that minimizes the problems of known technology. In particular, the purpose of the invention is to provide an arrangement, which can be used to improve the structure and the operation of the prechamber, enabling a simple installation and facilitating the maintenance and repair operations.
The objects of the invention are achieved as is described in claim 1 and more in detail in the other claims. According to the invention, the body part is supported on a cylinder head and provided with joint surfaces to support the nozzle part on the body part. As only the body part is supported on the cylinder head, the solution is simple and easy to install and detach for maintenance and repair. The said joint surfaces of the body part are preferably conical. The nozzle part can preferably be attached to the body part by means of a shrink fit, whereby these parts are made to compress against each other so that the arrangement stays together without extra components and other fastening means.
According to a preferred embodiment of the invention, the prechamber arrangement comprises a locking part arranged inside the prechamber, by which the nozzle part is attached to the body part. The separate locking part can be used to ensure that the body part and the nozzle part stay in place attached to each other under all conditions, but that they can still be detached from each other, as desired, depending on the attachment solution used.
The locking part can with advantage be attached to the body part by a shrink fit, welding, soldering, a friction joint or a threaded joint or the like.
In one embodiment, the locking part includes a wedge-shaped element, which is arranged between the actual locking part and the body part. In another embodiment, the locking part itself is a wedge-shaped component or a number of components that are arranged between the shaped head of the nozzle part, which is on the side of the prechamber, and the body part. The wedge effect can be used to further secure the stability of the attachment.
Taking into account the flow conditions of the prechamber, the locking part is shaped into a uniform structure so that no interferences are caused to the flows in the prechamber. When needed, the locking part can also be cooled.
The body part can with advantage be provided with a separate cover part, which is attached thereto and by means of which the prechamber arrangement is attached to the cylinder head. In this way, more freedom is allowed for the manufacture and the selection of materials. With respect to the manufacture, the body part can have stricter tolerance requirements because of the parts that are attached to the body part or parts that surround the same. The body part can preferably be manufactured of a heat-resistant material, such as steel or another metal alloy.
The cover part, in turn, is provided with an ignition means, such a feeding means of the pilot fuel and/or a spark plug, whereby its machineability is significant for the selection of material.
Both the nozzle part and the locking part can with advantage be manufactured of a heat-resistant, oxidation-resistant and/or corrosion-resistant material, such as ceramics. In these parts, the best properties of the ceramics can be utilized in the most advantageous manner.
For the manufacture, in particular, it is preferable that the body part and the locking part are rotationally symmetrical components. That way, also the behaviour of the components in varying heat and corrosion conditions is consistent, which is suited to prevent the parts from breaking.
Accordingly, on certain preconditions, the invention also enables the body part, the nozzle part and the locking part to be replaceable. In that case, when a part breaks, the remaining parts can be utilized, which is advantageous for the maintenance and the costs.
In the following, the invention is described by way of examples and with refer- ence to the appended schematic drawings, in which
Fig. 1 shows a basic cross section of the upper part of a cylinder of an engine and its cylinder head, and a cutaway drawing of a prechamber arrangement according to the invention installed in connection therewith; Fig. 2 shows an enlargement of the arrangement of the locking part and the nozzle part based on the prechamber arrangement of Fig. 1 ,
Figs. 3 and 4 show enlargements of alternative embodiments of the locking part related to the prechamber arrangement according to the invention. Reference number 1 in the drawings refers to a combustion engine comprising a cylinder head 2 and at least one cylinder including a cylinder sleeve 6 and a main combustion space 7. The gas exchange of the cylinder is arranged, in a manner known per se, through the channels of the cylinder head 2 and the valves that are provided in connection with the same.
As can be seen in Fig. 1 , in connection with the cylinder head 2, there is a separate prechamber arrangement connected to the cylinder, including a body part 4 and a cover part 9 that is supported on the body part, which together essentially define a prechamber 3, which through a nozzle part 5 provided with nozzle openings 5a communicates with the main combustion space 7 of the cylinder.
The cylinder head 2 comprises a recess or a similar space for the prechamber arrangement, whereby the body part 4 is supported on the cylinder head 2 by means of its joint surface 4a. The attachment of the body part 4 to the cylinder head 2 is arranged by means of the cover part 9 by bolts 10. The cover part 9 does not need to be separately attached to the body part 4, but these parts are arranged against each other by means of suitably shaped corresponding sur- faces, as shown in Fig. 1. The cover part 9 comprises, in a manner known per se, what are called feeding means 11 for the pilot fuel and a spark plug 12. The ignition and combustion process itself is carried out in a manner known as such; therefore, it is not described here in detail.
As further shown in Fig. 1 , the lower part of the body part 4 is shaped so that the nozzle part 5 of the prechamber arrangement is directly supported on the body part 4. The body part 4 can be manufactured of steel or another metal alloy that is good in enduring heat, and the nozzle part 5 preferably comprises ceramic or other corresponding material, which also endures intense heat and cor- rosion. Consequently, the body part 4 and the nozzle part 5 can preferably be attached to each other, for example, utilizing the shrink fit and without any other fastenings. Consequently, they can also be detached from each other, as needed, and thus also separately replaced.
The solution in Fig. 1 is only schematic; therefore, the prechamber in practice is shaped in a manner required by the desired flow conditions, generally, on the inside by using rounded surfaces. The number, the size and the orientation of the nozzle openings 5a of the nozzle part 5 are selected as needed. In practice, the joint surface 4a of the body part 4 can preferably be conical. Similarly, the joint surface 4b between the body part 4 and the nozzle part 5 is preferably conical in the manner shown in the figure. When the body part 4 is made of steel or other suitable metal alloy, its machineability is better compared with that of ceramics. Consequently, the surfaces, which require more accurate dimensioning and are used to attach the prechamber arrangement to the cylinder head 2, are preferably placed in the body part 4.
As shown in Fig. 1 , the body part 4 and the nozzle part 5 can also be attached to each other by means of a separate locking part 8, which can be attached to the body part 4, for example, by a shrink fit, welding, soldering, a threaded joint, or in some other similar manner. In that case, whether the parts can also be separately dismounted and replaced, naturally depends on the way of attachment selected. In any case, the locking part 8 can be used to secure the attachment of the nozzle part 5, as needed, and its staying in place under the operating conditions of the engine.
In the embodiment of Fig. 1 , the locking part 8 is preferably a uniform, annular component. This is best seen in Fig. 2, which shows an enlargement of the arrangement of the locking part and the nozzle part based on the prechamber arrangement of Fig. 1. Figs. 3 and 4 show alternative embodiments of the locking part, comprising a wedge shape and, as a consequence, a wedge effect, pro- viding additional possibilities for the selection of the way of attachment. In the solution of Fig. 3, the locking part comprises two components 8a and 8b, the latter providing the wedge effect. Component 8a, in turn, can preferably be attached by the shrink fit to the rest of the structure, whereby it can also be detached and replaced but, as needed, the attachment can also be carried out by welding, for example.
In the solution of Fig. 4, in turn, the upper end 5b of the nozzle part 5 is shaped to be upwards convergent in the figure so that the actual locking part 8' herein is a wedge-shaped component that is installed between the said upper end of the nozzle part 5 and the body part 4.
In the embodiments of Figs. 3 and 4, the nozzle part 5 can also be constructed of various components, such as sectors, and they can be attached to the body part 4 by means of the locking part 8 or 8'.
The invention is not limited to the embodiments presented, but various modifications can be considered within the appended claims.

Claims

CLAIMS:
1. A prechamber arrangement to be fitted into the cylinder head (2) of a combustion engine (1 ), comprising a separate body part (4) and a nozzle part (5), which together mainly define a prechamber (3), which is connected to a main combustion space (7) of a cylinder (6) through nozzle openings (5a) of the nozzle part (5), characterized in that the body part (4) is supported on the cylinder head (2) and provided with joint surfaces (4b) for supporting the nozzle part (5) on the body part (4).
2. A prechamber arrangement according to claim 1 , characterized in that the said joint surfaces (4b) are conical.
3. A prechamber arrangement according to claim 1 or 2, characterized in that the nozzle part (5) is attached to the body part (4) by means of a shrink fit.
4. A prechamber arrangement according to any of the preceding claims, characterized in that it comprises a locking part (8) that is arranged inside the prechamber (3) for attaching the nozzle part (5) to the body part (4).
5. A prechamber arrangement according to claim 4, characterized in that the locking part (8) is attached to the body part (4) by a shrink fit, welding, soldering, a friction joint, a threaded joint, or in a corresponding manner.
6. A prechamber arrangement according to claim 4 or 5, characterized in that the locking part (8) includes a wedge-shaped element (8b), which is arranged between the actual locking part (8) and the body part (4).
7. A prechamber arrangement according to claim 4 or 5, characterized in that the locking part is a wedge-shaped component (8') or a number of components that are arranged between the shaped end (5b) of the nozzle part (5), which is on the side of the prechamber (3), and the body part (4).
8. A prechamber arrangement according to any of claims 4 to 7, characterized in that the locking part (8, 8a, 8') is shaped into a uniform structure, taking into account the flowing conditions in the prechamber (3).
9. A prechamber arrangement according to any of the preceding claims, characterized in that the body part (4) is provided with a separate cover part (9), which is attached thereto and through which the prechamber arrangement is attached to the cylinder head (2).
10. A prechamber arrangement according to claim 9, characterized in that the cover part (9) is provided with an ignition means, such as the feeding means (11 ) of a pilot fuel and/or a spark plug (12).
11.A prechamber arrangement according to any of the preceding claims, characterized in that the nozzle part (5) and/or the locking part (8, 8a, 8') are manufactured of a heat, oxidation and/or corrosion resistant material, such as ceramics.
12.A prechamber arrangement according to any of the preceding claims, characterized in that the body part (4) and the locking part (8, 8a, 8') are rota- tionally symmetrical components.
13.A prechamber arrangement according to any of the preceding claims, char- acterized in that the body part (4), the nozzle part (5) and the locking part
(8, 8a, 8') are replaceable components.
EP08847324A 2007-11-09 2008-10-22 Prechamber arrangement of a combustion engine Active EP2205840B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20075793A FI121759B (en) 2007-11-09 2007-11-09 Internal combustion engine pre-chamber arrangement
PCT/FI2008/050591 WO2009060119A1 (en) 2007-11-09 2008-10-22 Prechamber arrangement of a combustion engine

Publications (2)

Publication Number Publication Date
EP2205840A1 true EP2205840A1 (en) 2010-07-14
EP2205840B1 EP2205840B1 (en) 2012-02-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08847324A Active EP2205840B1 (en) 2007-11-09 2008-10-22 Prechamber arrangement of a combustion engine

Country Status (8)

Country Link
EP (1) EP2205840B1 (en)
JP (1) JP5476309B2 (en)
KR (1) KR101510913B1 (en)
CN (1) CN101855427B (en)
AT (1) ATE546624T1 (en)
ES (1) ES2382577T3 (en)
FI (1) FI121759B (en)
WO (1) WO2009060119A1 (en)

Cited By (2)

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WO2018071215A1 (en) 2016-10-14 2018-04-19 Caterpillar Inc. Prechamber ignition device for internal combustion engine, and method
US10641159B2 (en) 2016-09-23 2020-05-05 Caterpillar Inc. Pre-chamber assembly for fuel injector

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI125706B (en) * 2010-02-22 2016-01-15 Wärtsilä Finland Oy THE COMBUSTION ENGINE OF THE COMBUSTION ENGINE
US8584648B2 (en) 2010-11-23 2013-11-19 Woodward, Inc. Controlled spark ignited flame kernel flow
US9172217B2 (en) 2010-11-23 2015-10-27 Woodward, Inc. Pre-chamber spark plug with tubular electrode and method of manufacturing same
US9476347B2 (en) 2010-11-23 2016-10-25 Woodward, Inc. Controlled spark ignited flame kernel flow in fuel-fed prechambers
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FI121759B (en) 2011-03-31
CN101855427A (en) 2010-10-06
EP2205840B1 (en) 2012-02-22
FI20075793A0 (en) 2007-11-09
WO2009060119A1 (en) 2009-05-14
FI20075793A (en) 2009-05-10
ATE546624T1 (en) 2012-03-15
KR20100087319A (en) 2010-08-04
ES2382577T3 (en) 2012-06-11
CN101855427B (en) 2012-08-08
JP5476309B2 (en) 2014-04-23
KR101510913B1 (en) 2015-04-10
JP2011503416A (en) 2011-01-27

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